Maximum initial planet mass an interior planet (to planet b) could have had and be consistent with photo-evaporation, assuming planet b retained its atmosphere against photo-evaporation. Given the possibility that dynamical re-arrangement within the system might have occurred, we performed this calculation assuming that planet b had an initial period identical to its current period (orange), a shorter initial orbital period of 8 days (blue), or a longer initial orbital period of 18 days (green). The shaded region encompasses the 1 σ error bars, mainly arising from uncertainties in the properties of planet b. The current architecture of the system is shown by the blue points. The two interior planets to b lie below the curves, which indicates the system is consistent with photo-evaporation sculpting the system before any dynamical re-arrangement.